/* clock em Hz */
#define F_CPU 16000000UL

#include <avr/io.h>
#include <util/delay.h>

int main(void) {
  /* set PC5 to output */
  DDRC |= 1 << PC5;
  while(1) {
    /* LED on */
    PORTC |= 1 << PC5;
    _delay_ms(500);
    /* LED off */
    PORTC &= ~(1 << PC5);
    _delay_ms(500);
  }
  return 0;
}

